+/*
+ * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file stdin.c Functions that deal with reading from stdin. */
+
+#include <dirent.h> /* readdir() */
+#include <assert.h>
+
+
#include "para.h"
#include "string.h"
#include "list.h"
#include "error.h"
#include "stdin.h"
-void stdin_pre_select(struct sched *s, struct task *t)
+/**
+ * The pre_select function of the stdin task.
+ *
+ * \param s The scheduler this task was registered to.
+ * \param t The task structure of the stdin task.
+ *
+ * This function is always successful. If there is space left in the
+ * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
+ * of \a s.
+ */
+static void stdin_pre_select(struct sched *s, struct task *t)
{
- struct stdin_task *sit = t->private_data;
- if (sit->loaded < sit->bufsize)
- para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
- t->ret = 1; /* success */
+ struct stdin_task *sit = container_of(t, struct stdin_task, task);
+
+ if (sit->output_error && *sit->output_error < 0) {
+ t->error = *sit->output_error;
+ return;
+ }
+ t->error = 0;
+ sit->check_fd = 0;
+ if (sit->loaded >= sit->bufsize)
+ return;
+ sit->check_fd = 1;
+ para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
}
-void stdin_post_select(struct sched *s, struct task *t)
+/**
+ * The post select function of the stdin task.
+ *
+ * \param s The scheduler this task was registered to.
+ * \param t The task structure of the stdin task.
+ *
+ * This function checks if \p STDIN_FILENO was included by in the read fd set
+ * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
+ * appears to be readable, data is read from stdin into the buffer of the
+ * stdin task.
+ */
+static void stdin_post_select(struct sched *s, struct task *t)
{
- struct stdin_task *sit = t->private_data;
+ struct stdin_task *sit = container_of(t, struct stdin_task, task);
ssize_t ret;
- t->ret = 1;
- if (sit->loaded >= sit->bufsize)
+ if (sit->output_error && *sit->output_error < 0) {
+ t->error = *sit->output_error;
+ return;
+ }
+ t->error = 0;
+ if (!sit->check_fd)
return;
if (!FD_ISSET(STDIN_FILENO, &s->rfds))
return;
ret = read(STDIN_FILENO, sit->buf + sit->loaded, sit->bufsize - sit->loaded);
if (ret < 0)
- t->ret = -E_STDIN_READ;
- else if (ret > 0) {
+ t->error = ERRNO_TO_PARA_ERROR(errno);
+ else if (ret > 0)
sit->loaded += ret;
- t->ret = ret;
- } else
- t->ret = -E_STDIN_EOF;
- if (t->ret < 0)
- sit->eof = 1;
+ else
+ t->error = -E_STDIN_EOF;
+}
+
+/**
+ * Initialize a stdin task structure with default values.
+ *
+ * \param sit The stdin task structure.
+ *
+ * This fills in the pre/post select function pointers of the task structure
+ * given by \a sit. Moreover, the stdin file desctiptor is set to nonblocking
+ * mode and \a bufsize is initialized to 16 KB (but no buffer is allocated).
+ */
+void stdin_set_defaults(struct stdin_task *sit)
+{
+ int ret;
+
+ sit->bufsize = 16 * 1024,
+ sit->task.pre_select = stdin_pre_select;
+ sit->task.post_select = stdin_post_select;
+ sprintf(sit->task.status, "stdin reader");
+ ret = mark_fd_nonblocking(STDIN_FILENO);
+ if (ret >= 0)
+ return;
+ sit->output_error = NULL;
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
}